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首页> 外文期刊>Engineering Structures >Bond behavior of high-strength recycled aggregate concrete-filled large square steel tubes with different connectors
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Bond behavior of high-strength recycled aggregate concrete-filled large square steel tubes with different connectors

机译：具有不同连接器的高强度再循环混凝土钢管的高强度再循环混凝土的债券行为

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摘要

To solve the problem of insufficient interface bond strength of concrete-filled square steel tubes (CFSSTs), 16 large CFSST specimens with eight different types of connectors (no additional connectors, built-in studs, built-in circular ribs, built-in vertical ribs, built-in reinforcement cage, and various combinations of the above) were designed for push-out testing. Specimens were constructed using high-strength concrete or high-strength recycled aggregate concrete (RAC). The bond behavior and slip failure mechanism were analyzed by comparing the force-slip curves, slip displacements, and steel tube strains. The bond strength calculation method and bondslip constitutive relationship of the interface under multiple parameters were obtained. Experiments revealed the following: bond-slip curves for CFSST without additional connectors were composed of an ascending section and a residual section; for tubes with different connectors, the peak values of the curves were higher; the performance-price ratio of studs and circular ribs for improving bond strength was high, and the combined use of studs and circular ribs can work well; the combination of circular ribs and vertical ribs can significantly improve bond strength and energy dissipation capacity; RAC had better bond behavior than normal concrete in HSCFSST without additional connectors or built-in vertical ribs. The predicted force-slip curves agreed well with the test curves, providing a theoretical basis for CFSST applications.
机译：解决混凝土钢管（CFSSTS）的界面粘合强度不足的问题，16种大型CFSST标本，具有八种不同类型的连接器（无需额外的连接器，内置螺柱，内置圆形肋骨，内置垂直设计了肋骨，内置加固笼和上述各种组合）用于推出测试。使用高强度混凝土或高强度再循环骨料混凝土（RAC）构建标本。通过比较力滑移曲线，滑移位移和钢管菌株来分析粘合行为和滑移机构。获得了多个参数下界面的键合强度计算方法和键合。实验揭示以下：CFSST的粘结曲线没有额外的连接器由升序和残余部分组成;对于具有不同连接器的管，曲线的峰值更高;用于改善粘合强度的螺柱和圆形肋骨的性能 - 价格比率高，螺柱和圆形肋的合并使用良好;圆形肋和垂直肋的组合可以显着提高粘合强度和能量耗散能力; RAC比HSCFSST中的正常混凝土具有更好的粘合行为，而无需额外的连接器或内置垂直肋。预测的力滑动曲线与测试曲线相加得很好，为CFSST应用提供理论基础。

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